The aim of this work was to evaluate the effects of repeated pruning interventions using different pruning methods on growth, physiology and breaking stress of sycamore maple (Acer pseudoplatanus L.). In February 2008, established maple were pruned in order to reduce leaf area by 1/3 according to the following treatments: 1) topping; 2) removal cut; 3) reduction cut; 4) control. In control trees, 6 imaginary cuts per plant were drawn and monitored through the experiment. In February 2010, trees were pruned again using the same treatments. The experimental design was a one-tree per replicate complete randomized design with 7 replicates. Leaf gas exchange, leaf greenness index and shoot starch content were measured several times in three growing seasons following the first pruning event. Biochemical parameters affecting photosynthesis were calculate from CO2 response curves. Leaf area and leaf mass per area were measured once per year. Wound closure was measured on all cuts using the Woundwood Coefficient. Length, base diameter and slenderness of the pruned branch, of the leader, and of lateral shoots were measured yearly. The stress required to cause the failing of the attachment between the primary branch and 1) the lateral branch which was selected as new leader (RD); 2) the lateral branch originated after topping which was selected as new leader (T); 3) the lateral branch normally attached to a primary branch which was selected as imaginary leader (C) was measured 2 years after pruning. Results showed that different pruning methods affect tree structure and physiological processes.
Effect of repeated pruning cycles on growth of physiology of maple trees / Alessio Fini; Marco Faoro; Gabriele Amoroso; Riccardo Piatti; Piero Frangi; Francesco Ferrini. - STAMPA. - (2011), pp. 1-8. (Intervento presentato al convegno Urban Tree Growth Symposium tenutosi a Lisle, IL nel 12-13 settembre 2011).
Effect of repeated pruning cycles on growth of physiology of maple trees
FINI, ALESSIO;FERRINI, FRANCESCO
2011
Abstract
The aim of this work was to evaluate the effects of repeated pruning interventions using different pruning methods on growth, physiology and breaking stress of sycamore maple (Acer pseudoplatanus L.). In February 2008, established maple were pruned in order to reduce leaf area by 1/3 according to the following treatments: 1) topping; 2) removal cut; 3) reduction cut; 4) control. In control trees, 6 imaginary cuts per plant were drawn and monitored through the experiment. In February 2010, trees were pruned again using the same treatments. The experimental design was a one-tree per replicate complete randomized design with 7 replicates. Leaf gas exchange, leaf greenness index and shoot starch content were measured several times in three growing seasons following the first pruning event. Biochemical parameters affecting photosynthesis were calculate from CO2 response curves. Leaf area and leaf mass per area were measured once per year. Wound closure was measured on all cuts using the Woundwood Coefficient. Length, base diameter and slenderness of the pruned branch, of the leader, and of lateral shoots were measured yearly. The stress required to cause the failing of the attachment between the primary branch and 1) the lateral branch which was selected as new leader (RD); 2) the lateral branch originated after topping which was selected as new leader (T); 3) the lateral branch normally attached to a primary branch which was selected as imaginary leader (C) was measured 2 years after pruning. Results showed that different pruning methods affect tree structure and physiological processes.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.